The object of this paper is to investigate the effects of geometry and load perturbation to buckling in multilayered pressure vessel heads. The pressure vessel head in concern is thin walled torispherical geometry. Geometric and load perturbation can alter both the critical load for buckling and the buckled shape. Two and three layered torsispherical heads are considered. Two layered models include steel-aluminum and titanium-aluminum configurations and three layered models include copper-steel-copper configuration. Internally pressurized three-dimensional torispherical pressure vessel head model that is previously used in literature is constructed. As a first step eigenvalue solutions are obtained for each model. After this instability solutions with large deformation effects are conducted to obtain more realistic instability pressure values nonlinear. The solution is performed by finite element program ANSYS Workbench. In nonlinear analyses, perfectly plastic material model is used. It is concluded that geometric and load perturbations cause the instability pressure to decrease and cause the structure to buckle at a lower pressure value. It is also observed that for steel-aluminum configuration geometric perturbation is more critical than load perturbation whereas for aluminum-titanium the reverse is valid.
Shopping carts are essential parts used in shopping. There are differences between shopping carts used today. The most prominent of these differences is that some carts have only the front two free rolling wheels, the rear two wheels are fixed rolling wheels, and some carts have four free rolling wheels. In this study, the effects of this difference in shopping carts on joints of the human body under different conditions were simulated using analysis software and the results were compared. As a result, it has been determined that European style shopping carts with four free rolling wheels need more force when going straight than other type of shopping carts with two free rolling wheels and need less force in case of rotation. In addition, when these forces are applied on the human model and gravity is neglected, it has been determined that the reaction of the joints is close to each other.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.